ارزیابی کارایی روش نیمه کمّی مدل AquaCrop برای پیش‌بینی رشد تربچه با سطوح مختلف کود نیتروژن

نوع مقاله: مقاله پژوهشی

نویسندگان

1 داتشجوی ارشد گروه مهندسی آبیاری و زهکشی، پردیس ابوریحان، دانشگاه تهران، پاکدشت، ایران

2 استاد گروه مهندسی آبیاری و زهکشی، پردیس ابوریحان، دانشگاه تهران، پاکدشت، ایران

3 استادیار گروه علوم باغبانی، پردیس ابوریحان، دانشگاه تهران، پاکدشت، ایران

چکیده

در این پژوهش کارایی روش نیمه کمی(Semi-quantitative)  در مدل شبیه‌سازی رشد گیاه(AquaCrop)  برای پیش‌بینی زیست‌توده و پوشش گیاهی تحت مدیریت‌های مختلف کود نیتروژن از طریق مقایسه پارامترهای شبیه‌سازی‌شده با نتایج اندازه‌گیری در گلخانه ارزیابی گردید. گیاه تربچه رقم چریبل (cherrybel) طی دو دوره (بهمن ماه 1396 و فروردین 1397) در گلخانه پردیس ابوریحان دانشگاه تهران، بدون تنش آبی و حرارتی کشت شد. آزمایش به صورت طرح بلوک‌های کامل تصادفی تحت تیمارهای مختلف کودی صفر به عنوان شاهد (N0)، 50(N1) ، 100(N2)، 150 (N3)، 200 (N4)، 250 کیلوگرم نیتروژن در هکتار(N5) ، به صورت اوره با سه تکرار انجام شد. داده­های تیمار N0 و N3 در کشت اول برای واسنجی­ و سایر داده­ها برای صحت­سنجی مدل استفاده گردید. برای ارزیابی عملکرد مدل از شاخص‌های آماری ریشه میانگین مربعات خطای نسبی (RRMSE)، ضریب تعیین (R2) و متوسط خطای اریب (MBE) استفاده شد. در مرحله واسنجی مقدار این پارامترها در شبیه­سازی زیست‌توده به ترتیب برابر%12/11، 973/0، 032/0 تن در هکتار برای N0 و %32/10، 975/0 و 002/0- تن در هکتار برای N3 و در شبیه­سازی پوشش گیاهی به ترتیب%93/15، 884/0 و %30/4 برای N0 و % 84/12، 916/0 و %94/5 برای N3 به دست آمد. همچنین در مرحله صحت­سنجی محدوده تغییرات این مقادیر در پیش‌بینی زیست‌توده به ترتیب برابر % 7/25-7/13، 988/0-923/0 و 118/0-110/0- تن در هکتار و در پیش‌بینی پوشش گیاهی به ترتیب % 4/25-19، 867/0-768/0 و % 8/10-7/5 به دست آمد. بر اساس نتایج، مدل AquaCrop، زیست‌توده و پوشش گیاهی را تحت سطوح مختلف کود نیتروژن با دقت بالایی در طول دوره رشد گیاه شبیه‌سازی نمود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Performance Evaluation of the AquaCrop Semi-quantitative Method for Prediction of Radish Growth under Different Levels of Nitrogen Fertilizer

نویسندگان [English]

  • Parisa Ataei 1
  • Ali Rahimikhoob 2
  • Mostafa Arab 3
1 Master Science Student, Department of Irrigation and Drainage Engineering, Aburaihan Campus, University of Tehran,Pakdasht,Iran.
2 Professor, Department of Irrigation and Drainage Engineering, Aburaihan Campus, University of Tehran, Pakdasht, Iran.
3 Assistance Professor, Department of Horticulture, Aburaihan Campus, University of Tehran, Pakdasht, Iran.
چکیده [English]

In this research, the performance of semi-quantitative method in AquaCrop model for prediction of biomass and vegetation under various nitrogen fertilizer managements was evaluated by comparing the simulated parameters with the measured results in the greenhouse. The radish cherrybel cultivar was cultivated in the greenhouse of Pardis Aburaihan, University of Tehran without thermal and water stress during two periods (February 2018 and April 2018). The experiment was conducted as a randomized complete block design with different treatments such as zero fertilizer as control (N0), 50 (N1), 100 (N2), 150 (N3), 200 (N4), 250 kg nitrogen per hectare (N5), using Urea fertilizer with three replications. N0 and N3 treatment data of the first cultivation period were used for calibration and the other data were applied for model validation. Relative Root Mean Square Error (RRMSE), Determination Coefficient (R2) and Mean Bios Error (MBE) were used to evaluate the performance of model. The values of these parameters (RRMSE, R2 and MBE) for biomass simulation were 11.12%, 0.973, 0.032 ton.ha-1, respectively for N0 and 10.32%, 0.975, and -0.002 ton.ha-1, respectively for N3 in the calibration step. These parameters for canopy cover simulation were 15.93%, 0.884 and 4.30%, respectively for N0 and 12.84%, 0.916 and 5.94%, respectively for N3 in the calibration step. Also, in the validation step, the range of changes in these parameters for biomass simulation were 13.7-25.7%, 0.923-0.988, -0.110-0.118 ton.ha-1 and for canopy cover simulation were 19-25.4%, 0.768-0.867, 5.7-10.18%, respectively. Based on the results, AquaCrop model simulated the biomass and canopy cover precisely under different levels of nitrogen fertilizer and during the growing period.

کلیدواژه‌ها [English]

  • AquaCrop
  • nitrogen
  • radish
  • semi-quantitative method
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